From the root 'a-z-m which has the following classical Arabic connotations:

to be great, large, bigto be vast, huge, enormousto be great in rank, importance or dignityto be imposing, powerful, superiorto be magnificent, honored, revered, sublimeto be immense, stupendous, loftyto be above imperfection

This name is used in the Qur'ân. For example, see 2:255

Note that the Arabic letter z sounds nothing at all like the English letter z, but rather is a open-jaw "th" sound.

Related names:

Jalîl is considered to be greatness in attributes.

Kabîr denotes the One whose essence is greatness.

Azîm is greatness in both attributes and self.

Mutakabbir is an empathic form which denotes actively using rights, privileges, rank and attributes that are above and beyond the rights of everyone else.